KR100503987B1 - Multi-tap apparatus - Google Patents

Abstract

Disclosed is a multi-tap device in which power supply to an auxiliary device through a slave connector can be linked when a main device connected to a master connector is operated. The power strip device includes a master connector connected to a power cord, at least one slave connector connected in parallel with the master connector, an interlocking switch element installed to turn on / off electrical connection from the power cord to the slave connector, and a master connector. The current detector for detecting the current supplied to the main system through the signal, the adder for adding the signal output from the current detector to the set reference signal, and outputs the sum result signal, the signal output from the adder is more than the trigger reference signal And a linkage adjustment unit configured to control on / off of the linkage switch element in accordance with the recognition. The multi-tap device has a simple control circuit structure for interlocking with the operation of the master device connected to the master connector to automatically supply and cut off power to the slave connector, and to prevent malfunctions due to noise and power voltage fluctuations. There is an advantage that can be suppressed.

Description

Multi-tap apparatus

The present invention relates to a multi-tap device, and more particularly, to a multi-tap device in which power supply to an auxiliary device through a slave connector can be interlocked when a main device connected to a master connector is operated.

In order to supply commercial AC power to a plurality of electronic devices, a power strip device capable of supplying power input through a power cord in parallel to a plurality of connectors has been commercialized and widely used.

In such a multi-tap device, a power supply cord and a plurality of connectors are usually connected in parallel with each other, and a power switch capable of intermittently supplying current from each power cord to each connector is provided.

On the other hand, the computer system allows users to connect and use various peripheral devices such as monitors, printers, scanners, modems, etc. in addition to the main body of the computer, and to install such a computer system in a limited space, an outlet intermittently installed in a house or building. The power strip device is usefully used for the purpose of dividing the power from each device to each device.

Peripherals of such a computer system can perform their functions only when the computer main body is operated. When the computer main body is turned off, power consumption is generated. Therefore, when the user completes the use of the computer system, it is necessary to turn off the connected peripherals in addition to the computer main body to suppress unnecessary power waste. However, it is inconvenient for the user to operate all the power switches of each device every time the computer system is driven and turned off, and because of this inconvenience, the peripheral devices are often not turned off when the computer is not used, which wastes unnecessary power.

The control circuit of the multi-tap for improving this problem is disclosed in Korean Patent Laid-Open No. 2000-0036266. However, the multi-tap control circuit of Korean Patent Laid-Open Publication No. 2000-0036266 forms a primary winding on a current path from a power cord to a main tap, and detects electrical energy induced in the secondary winding by a turns ratio from the primary winding. As a result, reactive power is generated by the effective resistance of the primary winding and the current limiting resistors installed on the current path leading to the main tap. In addition, a series of circuits for integrating, amplifying, and comparing the electric energy induced through the secondary windings with a plurality of active devices are required, which complicates the circuit structure, and the driving power required to drive the devices for driving the respective circuits. There is an increasing disadvantage.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a multi-tap device which is simple in structure and can reduce power consumption required for interlocking control between a master connector and a slave connector.

In order to achieve the above object, the multi-tap device according to the present invention includes a master connector connected to a power cord; At least one slave connector connected in parallel with the master connector; An interlock switch element installed to turn on / off an electrical connection from the power cord to the slave connector; A current detector for detecting a current supplied to the main device through the master connector; An adder which adds a signal output from the current detector to a set reference signal and outputs a sum result; And an interlocking adjustment unit configured to control on / off of the interlocking switch element according to whether the signal output from the adding unit is equal to or greater than a trigger reference signal.

According to an aspect of the invention, the interlocking control unit and the first transistor for receiving the output signal of the adder to the base end; A second transistor which is switched in connection with the presence or absence of the first transistor; And a third transistor installed on a current supply path to the interlocking switch element which is turned on / off according to the presence or absence of a current, and turned off / on in reverse with respect to the on / off of the second transistor.

A first capacitor connected between the emitter terminal and the ground terminal of the first transistor; A diode provided on the emitter terminal of the first transistor and the base terminal of the second transistor; It is preferable to further include a second capacitor provided between the base terminal and the ground terminal of the second transistor.

The light emitting device may further include a light emitting device disposed on the current conduction path of the third transistor or on the current conduction path of the second transistor to display the on / off state of the interlock switch to the outside.

In addition, the reference signal variable is preferably provided so that the user can adjust the level of the reference signal.

According to another aspect of the invention, the linkage adjusting unit and the first transistor for receiving the output signal of the adder to the base end; And a second transistor installed on a current supply path to the interlocking switch element that is turned on / off according to the presence or absence of a current, and turned on / off in phase with respect to the on / off of the first transistor.

The light emitting device may further include a light emitting device disposed on a current supply path of the first transistor to correspond to on / off of the first transistor.

Preferably, the current detector is a current transformer provided on a power line from the power cord to the master connector.

Hereinafter, a multi-tap device according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view schematically showing a multi-tap device according to the present invention.

Referring to the drawings, the power strip device 10 includes a power cord 11, a power cord 11, and a power strip body 20 connected through an electric wire cable 12.

The master connector 21 and the plurality of slave connectors 22 are exposed to the power strip main body 20 so that power plugs of other electronic devices can be inserted. An interlock control circuit (not shown) for controlling the supply of current from the power cord 11 to each of the slave connectors 22 is provided inside the main body.

It goes without saying that the number of slave connectors 22 can be appropriately determined.

An example of an interlocking control circuit for controlling the interlocking of the slave connectors 22 to the master connector 21 of the power strip device 10 is shown in FIG. 2.

Referring to the drawings, the interlocking control circuit controls the interlocking switch 29a and the interlocking switch 29a installed to turn on / off the power supply to the slave connectors 22 connected in parallel with the master connector 21. It is provided with an interlocking adjustment part.

The master connector 21 is connected to supply lines 11a and 11b respectively connected to both terminals of the power cord 11.

Each terminal of the slave connectors 22 is directly connected in common with the first supply line 11a of the two supply lines 11a and 11b, and is commonly connected with the second supply line 11b via an interlocking switch 29a. Is connected.

Although not shown, a main power switch capable of interrupting the first supply line 11a or the second supply line 11b may be installed. In this case, the main power switch is installed to be exposed on the power strip main body 20 so as to allow user manipulation.

Reference numeral 23 denotes a rectifier for rectifying the AC current supplied from the AC power supply 40 branched from the supply lines 11a and 11b, and reference numeral 25 decompresses the DC power generated by the rectifier 23 to a desired level of voltage. It is a pressure reduction part.

Zener die (ZD1) is applied to the decompression unit 25 to suppress the voltage fluctuation. The output voltage of the decompression section 25 is used as a control power supply for the interlock adjustment section.

Reference numeral 24 is a current transformer (CT) as a current detector. The current transformer CT is a known element, which is a supply line 11c outside the detection line supplied to the master connector 21, that is, branched from the second supply line 11b to the master connector 21 as shown in the illustrated example. In this case, the wire is wound in a coil shape, or alternatively, the wire is wound in a coil shape in a predetermined shape such as a ring-shaped magnetic material having an opening so that the supply line 11c can penetrate the wire 11c to increase the sensitivity. It is installed to penetrate the opening. This current transformer is also commonly referred to as an inductive current detector or probe type current detector, and indirectly directs the current flowing through the supply line 11c by an induction-sensitive method by electromagnetic force generated by the current flowing through the detection target supply line 11c. Detect. The inductive current detector is applied to the control circuit of Korean Patent Application Laid-Open No. 2000-0036266, and has an advantage of low power consumption compared to a method of directly coupling a primary and a secondary winding to a magnetic core.

The interlock switch 29a has a relay switch applied thereto, and the illustrated type operates to be switched off when the current is applied and to be switched on when the current is interrupted.

The reference signal variable device 27 includes a fixed resistor R1 and a variable resistor V _R connected in series to divide the DC power supply passed through the pressure reducer 25 and supply it to the base terminal of the first transistor 31. consist of. The output voltage of the reference signal variable 27 is less than the trigger voltage of the base terminal of the first transistor 31 and the inductive sensitivity of the current transformer 24 and the power of the master device to be applied to the master connector 21. This can be done by considering consumption.

The voltage induced by the current transformer 24 is divided by the reference signal variabler 27 and added to the determined reference signal to be output to the base terminal of the first transistor. Here, the adder is implemented by connecting the reference signal voltage source of the current transformer 24 and the reference signal variable unit 27 without applying a separate element.

The second transistor 33 is connected to the DC power supply of the pressure reducer 25 so that the second transistor 33 can be interlocked and turned on when the first transistor 31 is turned on.

Emitter terminals and first terminals of the capacitors C5 and C6 and the first transistor 31 connected between the emitter terminal and the ground of the first transistor 31 and between the base terminal and the ground of the second transistor 33, respectively. The diode D1 connected between the base terminals of the two transistors 33 is for AC signal bypass and DC signal trigger. That is, instantaneous transient current (Inrush Current) when the power supply to the master connector 21 is started, or instantaneous when the output voltage fluctuates corresponding to the frequency of the AC power source 40 in the rectifying unit 23 and the pressure reducing unit 25 The second transistor 33 is suppressed from interlocking with respect to the turn-on of the first first transistor 31.

The third transistor 35 is turned on when the second transistor 33 is turned off by the bias voltage branched by the voltage dividing resistors R6 and R7, and on the contrary, the second transistor 33 is turned on. It is wired to be off. The bias voltage (voltage drop of R7) of the third transistor 35 determined by the voltage dividing resistors R6 and R7 is determined as the magnitude of the voltage capable of turning on the third transistor.

Look at the operation of such a power strip device.

First, when the current supply through the master connector 21 is fine or interrupted, the first transistor 31 and the second transistor 33 remain turned off, and the third transistor 35 is driven by a bias voltage. Keep turned on. At this time, the current supply from the decompression unit 25 to the interlock switch 29a is continued, the interlock switch 29a maintains a turn-off state, and the light emitting element 38 emits light.

Herein, the light emitting state of the light emitting element 38 serves to inform that the slave connector 22 is in an off connection state.

On the other hand, when the master device connected to the master connector 21 is turned on, current corresponding to the operating load of the master device is supplied to the master device through the master connector 21 via the supply lines 11a and 11b. Then, the current flowing through the supply line 11c leading to the master connector 21 rises to a value corresponding to the operating load of the master device, and the electromagnetic energy induced by the current transformer 24 responding to this increases. As a result, the induced voltage of the current transformer added to the reference voltage of the reference voltage variable part 27 exceeds the trigger voltage of the first transistor 31, so that the first transistor 31 and the second transistor 33 The third transistor 35 is sequentially turned on and turned off by the base voltage drop caused by the turn-on of the second transistor 33. At this time, the supply of current to the interlock switch 29a is cut off, the interlock switch 29a is turned on to enable power supply to the slave connector 22, and the light emitting element 38 is turned off. That is, the interlock switch 29a is turned on / off by the output signal of the current transformer which responds to the current rise / fall of the supply line 11c corresponding to the operation / non-operation of the master device connected to the master connector 21. .

Unlike the illustrated example, when the interlocking switch 29a is intended to apply the light emitting device 38 so that the interlocking switch 29a emits light when turned on and does not emit light when turned off, the light emitting device 38 may be replaced by the first transistor 31 or the illustrated position. The second transistor 33 may be provided on the current through path. As an example, an example in which a light emitting device is applied between the resistor R6 and the collector of the second transistor 33 is illustrated in FIG. 3. Although not shown, the light emitting element 38 may be provided on the current conduction path of the first transistor 31 in the same manner.

Meanwhile, an example in which a relay switch of a type opposite to the relay switch type described above, that is, a relay switch turned on when a current is applied is applied is illustrated in FIG. 4.

In FIG. 4, elements having the same functions as those shown in the previous drawings are denoted by the same reference numerals.

Referring to the drawing, the light emitting element 38 is connected between the collector terminal of the first transistor 31 and the DC voltage source of the pressure reducing section 25. In addition, the second transistor 53 is connected to receive the voltage drop signal of the resistor R8 connected between the emitter terminal of the first transistor 31 and the ground to the base terminal.

The second transistor 53 is provided so that the current conduction path from the DC power supply of the decompression unit 25 to the interlock switch 29b can be interrupted.

Therefore, when the electrical signal induced in the current transformer 24 added to the reference voltage set by the reference voltage variable unit 27 becomes a level at which the first transistor 51 can be turned on, the first transistor 51 is turned on. The second transistor 53 is also turned on in conjunction with the turn-on of the first transistor 51.

That is, the interlock switch 29b maintains the turn-off state when the current supplied to the master connector 21 is less than or equal to the set value, and maintains the turn-on state when the current supplied to the master connector 21 exceeds the set value. do.

In the above description, an example in which an NPN type transistor is applied to the type of the relay switch applied as the interlock switch 29 and the display / non-display type of the light emitting element 38 for displaying the turn on / off state of the slave connector 22 is shown. When the PNP type transistor is applied, the circuit may be configured correspondingly, and such a change may be sufficiently understood by those skilled in the art, and thus detailed description thereof will be omitted.

In addition, as a transistor used in the above description, various well-known three-terminal transistors such as a field effect transistor can be applied.

As described so far, the multi-tap device according to the present invention has a simple control circuit structure for interlocking with the operation of the master device connected to the master connector to automatically supply and cut off power to the slave connector. Therefore, there is an advantage that it can suppress the malfunction due to noise and power supply voltage fluctuation.

1 is a perspective view schematically showing a multi-tap device according to the present invention,

FIG. 2 is a linkage control circuit diagram according to a first embodiment of the multi-tap device of FIG. 1;

3 is an interlock control circuit diagram according to a second embodiment of the multi-tap device of FIG. 1;

4 is a diagram illustrating an interlocking control circuit according to a third embodiment of the multi-tap device of FIG. 1.

<Description of the reference numerals for the main parts of the drawings>

10: power strip device 11: wire cable

21: master connector 22: slave connector

23: rectifier 24: current transformer

25: decompression unit 27: reference voltage variable portion

29: interlock switch 31, 51: first transistor

33, 53: second transistor 35: third transistor

38: light emitting element

Claims (9)

delete A master connector connected to the power cord; At least one slave connector connected in parallel with the master connector; An interlock switch element installed to turn on / off an electrical connection from the power cord to the slave connector; A current detector for detecting a current supplied to the main system through the master connector; An adder which adds a signal output from the current detector to a set reference signal and outputs a sum result;  Supplying the first transistor to receive the output signal of the adder to the base terminal, the second transistor to be switched in conjunction with the first transistor on or off and the current supply to the interlocking switch element on / off depending on the current supply And an interlocking adjustment unit formed on a path and configured to include a third transistor that is turned on and off in a reverse phase with respect to on / off of the second transistor. The semiconductor device of claim 2, further comprising: a first capacitor connected between the emitter terminal and the ground terminal of the first transistor; A diode provided on the emitter terminal of the first transistor and the base terminal of the second transistor; And a second capacitor provided between the base terminal of the second transistor and the ground terminal. The multi-tap apparatus according to claim 3, further comprising a light emitting element provided on the current conduction path of the third transistor so as to externally display the on / off state of the interlock switch. 4. The multi-tap apparatus according to claim 3, further comprising a light emitting element disposed on a current conduction path of the second transistor so as to externally display an on / off state of the interlock switch. The multi-tap apparatus according to claim 2, further comprising a reference signal variable that allows a user to adjust the level of the reference signal. The method of claim 2, wherein the linkage adjustment unit A first transistor configured to receive an output signal of the adder at its base end; And a second transistor installed on a current supply path to the interlocking switch element that is turned on / off according to a current supply, and turned on / off in phase with respect to the on / off of the first transistor. Device. The multi-tap apparatus according to claim 7, further comprising a light emitting element disposed on a current supply path of the first transistor so as to be turned on / off corresponding to on / off of the first transistor. The multi-tap apparatus according to claim 2, wherein the current detector is a current transformer provided on a power line from the power cord to the master connector.